it looks demanding. >> that's the great thing about the sport. you work your whole body so you're not just running. you do pushups, pullups, all the stuff you probably do on the weekends. >> yeah. absolutely. >> every weekend. >> i don't even know what tha purpo-- a burpy is. >> this weekend we have the world championships in vermont. people from all over are coming to compete. big purse, $250,000 in prize money. >> wow. >> we have people coming from as far away as mongolia. they're coming from everywhere to see who the top spartan racer is. >> we have racers here. don't we? >> we have some of our top racers here. >> let's bring him in, see what he can do. >> alex, come on in. we're going to have him do this course. i think we can break him in. >> but an awesome job setting this up. >> a lot going on here. >> ready, steady, go.